Fatal error: Uncaught Error: Interface 'Symfony\Component\Security\Core\User\UserCheckerInterface' not found in /home/benjamincb/demos/acdg/vendor/symfony/security-core/User/InMemoryUserChecker.php:24 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg/vendor/symfony/security-core/User/InMemoryUserChecker.php on line 24